Prof. Clete Ferguson

Helen Dobson

Joe Hayes

Captain Lucas

Jackson Foster

Lou Gibson

George Johnson

Police Captain

Woman on Boat (uncredited)

Patrol Boat Dispatcher (voice / uncredited)

Photographer (uncredited)

The Gill Man (in water) / Lab Technician (uncredited)

Miss Abbott (uncredited)

Cop (uncredited)

Jennings (uncredited)

Skipper (uncredited)

Cop (uncredited)

Pete (uncredited)

Mac - Spotlight Party Leader (uncredited)

The Gill Man (on land) / Marineland Diver (uncredited)

Diver (uncredited)

Charlie (uncredited)

Newscaster (uncredited)

Police Announcer (uncredited)

Dr. McCuller (uncredited)

Girl in Convertible

Search Party Member (uncredited)

Policeman (uncredited)

Joe (uncredited)

Man at Tank (uncredited)

Directing

Writing

Costume & Make-Up

Production

Camera

Production

Art

Art

Art

Sound

Sound

Editing

Art

Sound

Costume & Make-Up

Sound

Sound

Sound

Sound

Sound

Costume & Make-Up

Acting

Sound

Directing

Sound

Production

Sound

Crew

Acting

Acting

Costume & Make-Up

Sound